JERUSALEM — Israel’s closing of its border crossings with Gaza remained in effect Sunday, and Gaza’s only electricity plant shut down because of a shortage of imported fuel needed to run it.

Israel’s defense minister, Ehud Barak, ordered a temporary halt on all imports into the Hamas-run Gaza Strip late last week. The measure, along with stepped-up military operations in Gaza, was meant to persuade Palestinian militants there to stop firing rockets at Israel.

A spokeswoman for Mr. Barak said Sunday that the decision would most likely be re-evaluated in a few days.

Five rockets had been launched from Gaza by nightfall on Sunday, two of which landed in and around the Israeli border town of Sderot, an army spokeswoman said. There was a marked decrease in rocket fire over the weekend, compared with the roughly 130 rockets that the army said had been launched from Gaza during four days last week.

Palestinian officials shut down Gaza’s power station on Sunday night, leaving Gaza City in darkness. The manager of the power station, Rafiq Meliha, said local hospitals, water and sewage treatment facilities would also be affected.

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Israeli officials disputed Mr. Meliha’s assertions, saying that Israel still supplies Gaza with about 70 percent of its electricity requirements, while another 5 percent comes from Egypt. “That is all going on as usual,” said Shlomo Dror, a spokesman for the Defense Ministry. “Sure, the Palestinians can say they have no electricity and take down their turbines, but there is no crisis,” he insisted, adding that it is up to the Palestinians how they allocate whatever electricity they have within the Gaza Strip.

Moshe Kariv, a spokesman for the Israeli government body that deals with the Palestinians, said the situation in Gaza is “difficult” but that there was enough food “for a few days.”

About 70 Gazans were allowed to enter Israel for medical treatment on Sunday, according to an Israeli official at the crossings, but nothing else went in or out. Mr. Kariv acknowledged a shortage of medicine in Gaza, but said that was because of a problem with payment from the Palestinian side.

Separately, Israeli politicians expressed outrage on Sunday at a speech made by Sheik Hassan Nasrallah, the leader of the Hezbollah militia, who said in Beirut on Saturday that his organization possessed many body parts of Israeli soldiers left behind on the battlefields of southern Lebanon. Several ministers called for Sheik Nasrallah’s death and one called him a “sewer rat.”

In a statement released late Saturday night, the Israeli Army spokesman’s unit said that Sheik Nasrallah’s pronouncements “constitute a cruel and cynical move by an organization that flagrantly tramples the most fundamental ethical codes, shows no respect for human rights or the international conventions that govern these matters.”

Taghreed El-Khodary contributed reporting from Gaza City.

A version of this article appears in print on , on Page A7 of the New York edition with the headline: Fuel Shortage Shuts Gaza Power Plant, Leaving City Dark. Order Reprints|Today's Paper|Subscribe